What is the integral of 7xsqrt(x^2+9) ?

The integral of 7xsqrt(x^2+9) is 7/3 (x^2+9)^{3/2}+C

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integral of 7xsqrt(x^2+9)

\int 7 x x^{2} + 9 d x

\frac{7}{3} (x^{2} + 9)^{\frac{3}{2}} + C

Solution steps

\int 7 x x^{2} + 9 d x

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 7 \cdot \int x x^{2} + 9 d x

Apply u-substitution

: \int u^{2} d u

= 7 \cdot \int u^{2} d u

Apply the Power Rule

: \frac{u ^{3}}{3}

= 7 \cdot \frac{u ^{3}}{3}

Substitute back

u = x^{2} + 9

= 7 \cdot \frac{( x ^{2} + 9 ) ^{3}}{3}

Simplify

7 \cdot \frac{( x ^{2} + 9 ) ^{3}}{3} : \frac{7}{3} (x^{2} + 9)^{\frac{3}{2}}

= \frac{7}{3} (x^{2} + 9)^{\frac{3}{2}}

Add a constant to the solution

= \frac{7}{3} (x^{2} + 9)^{\frac{3}{2}} + C

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What is the integral of 7xsqrt(x^2+9) ?
The integral of 7xsqrt(x^2+9) is 7/3 (x^2+9)^{3/2}+C